Plug for electrical connections.



` PATENTED JULY' '7, 1908.

W. S. MAYER.

RLUG FOR ELECTRICAL CONNECTIONS.

nrLroA'mon rILrzn AUG. ze, 1907.

FG FZ-@l INVENTOH:

wmesses':

ffm

WALTER S. h'iAi'I-li, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR T0 TUE MACHEN S:

MAYER ELEC'lltlCAL MANUFACTURING COMPANY, OF PHILADELPHIA, PENNSYLVA- NIA, A CORPORATION OF NEW JERSEY.

PLUG FOR ELECTRICAL CONNECTIONS. i

Specication ofhLetter's Ilatent.

Patented July 7, 1908.

invention relates to an improvement` M in plugs adapted for use in 4the making of electrical connections to complete an electric circuit or circuits.

My invention also relates to an improvenient in the construction of face plates Vadapted to close the opening in the receptacle, into which the plug is placed.

. One-object of my invention is to provide al plug having its contact members so located yand placed thei-ein that` tl1e-arc f'ormed'guponA the withdrawal of the plug f romits receptacle occasions little orno damage upon its contact members.

A convenient embodiment of my invention .is illustrated in the accomfpanying drawings l 25 .forlnin a part of my speci cation, but it be un erstood that various 4chan es in the. detailsof construction maybe ma e without departing from the spirit and scope of my in vetioni l d In tlie'draxings-iligure I is a plan viewjiof the face plate of my device; Fi Il is a lon '1 tudiiial sectional view of the ace plate, Vt e plug and the receptacle FigCIII is a side elevatlon of the plug, showing a couple of cords connected thereto ;Fig.,IV- is a top' lan view of the receptacle, the face plate being fremoved; Fig. V is a view on the linev 5 5 of Fie. Of'ig. n1.

In the drawin ,`-1 designates a receptacle of any suitabas insulating material ,'such, for instance, as f orcelain'which lreceptacle is, as usual, a apted to be embedded in a wall. or other suitable sup `ort, though it need not necessarily be so ern edded. 2 designates a face plate ada ted to be connected to the receptacle 1. face plate is provided with a central openig,gas indicated at.

3, which is adapted to be closeidliy means of doors 4. The o posite sides of the opening 3= l1 lateral flanges 5 prefegablyvided with downwardly turned or lateral III g and Fig.VI ifs a view on the line -6` clamped between the heads of the same and flan es 6. 7 designates pivot pins which exten through the flanges 5 at opposite ends of the opening and which pivot )ins also extend through perforations in tire flanges upon the doors for the purpose of pivotingA the doors to the face plate, as clearly indicated in Figs. I and II of the drawings.

When the doors are closed, as'indicated in Fig. I, the top surfaces are flush with the surface of the face plate 2. A

Thel plug comprises a member l() of suit able insulating material, such, for instance, as porcelain. One" end of the lug is provided withan opening 11, throng which the electric conductor cords 12 ass into the in- .terior of the plug. The p ug is provided with depressions 15 in its 'opposite edges, into which portions 16 of contact members are adapted to be'located.

17 Idesignates n arrow strips of material which extend inwardly through openings 18 'in the plu from'the portions 16 of the c ontactJ mem ers. The contact members are held in place by means of screws 20, which 4pass partially through the' plug and have' screw-threaded engagement with the portion V 17of the contact'members, which are carried by the plug. They inner Aends ofthe narrow p ates 17 are turned up' to form shoulders, as Indicated at 21. Such shoulders 'may be formed, however, in any other suitable manner.

The ends of the electric conductor wires 12- are secured to the inwardly extending portions .17 by means of screws 25, which have screw-threaded engagement with thesaid members; the ends of the said conductors be ing ,wound around the said screws and the said portions 17 in the usual well-known manner.

The portions .16 of the contact members are adapted to engage with brushes 30 located in the interior ofthe receptacle 1.

These Vbrushes are secured toangularly shaped metallic stri s 31, which are connected to the receptace by means of binding 'scriews 32, the latter also being employed as a acens of connecting line wires (not shown)` the said strips for the passage of an elec' tric current through the brushes 30, when the latter' are in engagement with the conl tacts 16 of the plug. The contact 4'brushes 30 are pf VU-shape, as indicated 1n F1g.- II, and

i so

member, contact mem one portion thereof is connected to an arm 33, which is in turn connected to the strip 31. The stri s 31 are located in seats formed in the wal s of the receptacle, and that the arms 33 are of sufficient length to remove the brushes a considerable distance from the binding screws 32, so that when the plug is removed from the receptacle the electric arc produced has little or no effect upon the ends of the line wires or upon the plate 31 to which the said wires are connected.

It will be observed that the bottom of the plug is entirel closed and that the binding screws 25 are. ocated in depressions or seats formed in the sides of the plug, so that they are practically surrounded by the insulating material of which it is constructed. By

vmeans of this construction, it will be noted that only a comparatively smell portion of the contact devices 16-17 are i position to be sub'ected to the ac tion of the electric arc forme when the I lug is removed from its're- .ceiacle to break the electric circuit.

aving thus "described my invention, I claimz- 1. A plug for making electrical connections, comprising a member which is a nonconductor of electricity, the said member having peforations which are located out of alinement upon opposite sides of tliesaid bers located upon the opposite sides of the said member, and having projections extending through said perforatios, securing means extending from opposite sides of the said member and respectively engaging thesaid Vprojections to secure the contacts in place, and the said member having ope mngs u on its opposite sides communicating wlth the said perforations. 1

2. A plug for makin tions, comprising a mem electrical connecer which is a nonconductor of electricity, the bottom of. which member is closed, and the said member havin perforations extending from its opposite si es, contacts located upon opposite sides of the said member adjacent to the said perforations,the said contacts having projections which extend into the said perforations, means extend' the respective projections to secure the said contacts in 'securing means adapted from opposite sides position, and means for connecting electric conductor wires to the said rejections.

3. A plug for making eectrical connections, comprising a member which is a nonconducto'r of electricity, the said member havinv an openin extending through its centra portion, an also having perforations extending from op osite sides of the said member transversellj)r of and below the said opening through the `said member, and the said member having openings in its opposite sides communicating with the said perforations, contats l''ated upon opposite sides of the said mgeiiibei' in proximity tothe said perforations,= ithfesaid contacts having pro- Jections which extend into the said perforations, means for securing the said contacts to the said member and means electric wires to the said pro ections.`

4. A plug for makin el tions, comprising a mem er which is a nonconductor of electricity, the said member having perforations which are located upon opposite sides of the said member, contact members located'u on the opposite sides of the said member, t e said contact members having l.projections extending through the said pe orations, securing means extending from the sides of-thesaid 'member and respectively engaging the said' projections to secure thecontacts in place, and the said member having openings communicating with the said perforations.

5. A plug for makin electrical connections, comprising a-mem er which is a nonconductor of electricit the said member having perforations which are located out of alinement upon its oppositesides, contact` members located uponthe opposite sides of the said member, and having projecting arms extending into the said perfprations to engage the sai project arms to secure tlijcontacts in place, :iid means for secur electi'ic'conductor wires to the said lprojectm arms.

In testimony that I c aim the oregoing as my invention, I have hereunto signed my name this 21st day of Au st, A. D. 1907.

WAL' R S. MAYER.

In the presence of- F. WM. FINI; CHAnLEs H. UrnLL.

for securing sol 

